any game played with a ball 球类运动 - (North American English)
a game of baseball 棒球比赛
Idioms
a (whole) different/new ball game
- (informal)
a completely different kind of situation 截然不同的新局面 Camping in summer is fun, but in winter it’s a whole different ball game. 夏天野营很有趣，但冬天就完全不同了。